Who'd want to?

I'd hardly call British elections 'pure', though I suppose it all depends what you're used to, but I had to smirk at the end when I read this:

In short, I'm not sure why anyone would want the job of British prime minister for the next several years. But evidently, a few people still do.

I've been wondering the same thing for a while and I can come up with two possibilities - power mad, or just mad.